Elon Musk has become the first person estimated to reach a net worth of $US500 billion ($A756 billion), according to US magazine Forbes, largely held in shares of electric carmaker Tesla and aerospace firm SpaceX.

Forbes calculated Musk's wealth at roughly $US150 billion more than Oracle co-founder Larry Ellison.

Musk's wealth is harder to estimate than that of other billionaires because many of his companies are not publicly traded.

Musk surpassed the $US400 billion mark in December 2024, amid investor speculation that Tesla would benefit from his connections to then-newly elected US President Donald Trump. He frequently visited the White House early in Trump's term, but relations soured later and Trump threatened to cut federal support to Musk's firms.

Tesla sales also softened, part

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